Effect of inoculum level on xylitol production from rice straw hemicellulose hydrolysate byCandida guilliermondii

I C Roberto; S Sato; I M de Mancilha

Journal of Industrial Microbiology and Biotechnology 16(6): 348-350

1996


ISSN/ISBN: 1367-5435
DOI: 10.1007/bf01570113
Accession: 062527275

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Abstract
The effect of inoculum level on xylitol production by Candida guilliermondii was evaluated in a rice straw hemicellulose hydrolysate. High initial cell density did not show a positive effect in this bioconversion since increasing the initial cell density from 0.67 g L-1 to 2.41 g L-1 decreased both the rate of xylose utilization and xylitol accumulation. The maximum xylitol yield (0.71 g g-1) and volumetric productivity (0.56 g L-1 h-1) were reached with an inoculum level of 0.9 g L-1. These results show that under appropriate inoculum conditions rice straw hemicellulose hydrolysate can be converted into xylitol by the yeast C. guilliermondii with efficiency values as high as 77% of the theoretical maximum.